mirror of
https://github.com/edk2-porting/linux-next.git
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5b5ffff0d2
Fixes an issue whereby we may race with the table updates (before the core takes the struct_mutex) and so risk dereferencing a stale pointer in the iterator for /debugfs/.../i915_gem_objects. For example, [ 1524.757545] BUG: unable to handle kernel paging request at f53af748 [ 1524.757572] IP: [<c1406982>] per_file_stats+0x12/0x100 [ 1524.757599] *pdpt = 0000000001b13001 *pde = 00000000379fb067 *pte = 80000000353af060 [ 1524.757621] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC [ 1524.757637] Modules linked in: ctr ccm arc4 ath9k ath9k_common ath9k_hw ath snd_hda_codec_conexant mac80211 snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec bnep snd_hwdep rfcomm snd_pcm gpio_ich dell_wmi sparse_keymap snd_seq_midi hid_multitouch uvcvideo snd_seq_midi_event dell_laptop snd_rawmidi dcdbas snd_seq videobuf2_vmalloc videobuf2_memops videobuf2_core usbhid videodev snd_seq_device coretemp snd_timer hid joydev kvm_intel cfg80211 ath3k kvm btusb bluetooth serio_raw snd microcode soundcore lpc_ich wmi mac_hid parport_pc ppdev lp parport psmouse ahci libahci [ 1524.757825] CPU: 3 PID: 1911 Comm: intel-gpu-overl Tainted: G W OE 3.15.0-rc3+ #96 [ 1524.757840] Hardware name: Dell Inc. Inspiron 1090/Inspiron 1090, BIOS A06 08/23/2011 [ 1524.757855] task: f52f36c0 ti: f4cbc000 task.ti: f4cbc000 [ 1524.757869] EIP: 0060:[<c1406982>] EFLAGS: 00210202 CPU: 3 [ 1524.757884] EIP is at per_file_stats+0x12/0x100 [ 1524.757896] EAX: 0000002d EBX: 00000000 ECX: f4cbdefc EDX: f53af700 [ 1524.757909] ESI: c1406970 EDI: f53af700 EBP: f4cbde6c ESP: f4cbde5c [ 1524.757922] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 [ 1524.757934] CR0: 80050033 CR2: f53af748 CR3: 356af000 CR4: 000007f0 [ 1524.757945] Stack: [ 1524.757957] f4cbdefc 00000000 c1406970 f53af700 f4cbdea8 c12e5f15 f4cbdefc c1406970 [ 1524.757993] 0000ffff f4cbde90 0000002d f5dc5cd0 e4e80438 c1181d59 f4cbded8 f4d89900 [ 1524.758027] f5631b40 e5131074 c1903f37 f4cbdf28 c14068e6 f52648a0 c1927748 c1903f37 [ 1524.758062] Call Trace: [ 1524.758084] [<c1406970>] ? i915_gem_object_info+0x510/0x510 [ 1524.758106] [<c12e5f15>] idr_for_each+0xa5/0x100 [ 1524.758126] [<c1406970>] ? i915_gem_object_info+0x510/0x510 [ 1524.758148] [<c1181d59>] ? seq_vprintf+0x29/0x50 [ 1524.758168] [<c14068e6>] i915_gem_object_info+0x486/0x510 [ 1524.758189] [<c11823a6>] seq_read+0xd6/0x380 [ 1524.758208] [<c116d11d>] ? final_putname+0x1d/0x40 [ 1524.758227] [<c11822d0>] ? seq_hlist_next_percpu+0x90/0x90 [ 1524.758246] [<c1163e52>] vfs_read+0x82/0x150 [ 1524.758265] [<c11645d6>] SyS_read+0x46/0x90 [ 1524.758285] [<c16b8d8c>] sysenter_do_call+0x12/0x22 [ 1524.758298] Code: f5 8f 2a 00 83 c4 6c 31 c0 5b 5e 5f 5d c3 8d 74 26 00 8d bc 27 00 00 00 00 55 89 e5 57 56 53 83 ec 04 3e 8d 74 26 00 83 41 04 01 <8b> 42 48 01 41 08 8b 42 4c 89 d7 85 c0 75 07 8b 42 60 85 c0 74 [ 1524.758461] EIP: [<c1406982>] per_file_stats+0x12/0x100 SS:ESP 0068:f4cbde5c [ 1524.758485] CR2: 00000000f53af748 Reported-by: Sam Jansen <sam.jansen@starleaf.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Sam Jansen <sam.jansen@starleaf.com> Cc: stable@vger.kernel.org Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Jani Nikula <jani.nikula@intel.com> |
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| accessibility | ||
| acpi | ||
| amba | ||
| ata | ||
| atm | ||
| auxdisplay | ||
| base | ||
| bcma | ||
| block | ||
| bluetooth | ||
| bus | ||
| cdrom | ||
| char | ||
| clk | ||
| clocksource | ||
| connector | ||
| cpufreq | ||
| cpuidle | ||
| crypto | ||
| dca | ||
| devfreq | ||
| dio | ||
| dma | ||
| edac | ||
| eisa | ||
| extcon | ||
| firewire | ||
| firmware | ||
| fmc | ||
| gpio | ||
| gpu | ||
| hid | ||
| hsi | ||
| hv | ||
| hwmon | ||
| hwspinlock | ||
| i2c | ||
| ide | ||
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| input | ||
| iommu | ||
| ipack | ||
| irqchip | ||
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| misc | ||
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| net | ||
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| of | ||
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| parisc | ||
| parport | ||
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| phy | ||
| pinctrl | ||
| platform | ||
| pnp | ||
| power | ||
| powercap | ||
| pps | ||
| ps3 | ||
| ptp | ||
| pwm | ||
| rapidio | ||
| regulator | ||
| remoteproc | ||
| reset | ||
| rpmsg | ||
| rtc | ||
| s390 | ||
| sbus | ||
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| sh | ||
| sn | ||
| soc | ||
| spi | ||
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| ssb | ||
| staging | ||
| target | ||
| tc | ||
| thermal | ||
| tty | ||
| uio | ||
| usb | ||
| uwb | ||
| vfio | ||
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| video | ||
| virt | ||
| virtio | ||
| vlynq | ||
| vme | ||
| w1 | ||
| watchdog | ||
| xen | ||
| zorro | ||
| Kconfig | ||
| Makefile | ||